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- it would take an effort too big to develop the driver as open source

This is probably the biggie.. writing drivers in Windows is very hard (a
common theme on the driver lists is someone coming on wanting a 'quick
driver' to do something like encryption then slowly realizing that
they're looking at a 2 year timescale for a releaseable product).

I've no idea whether a PV driver could take shortcuts with its
development as it's not talking to real hardware, but anything less than
6 months (full time) is probably unrealistic. For that kind of work
people are going to want to be paid.

- or closed information would be needed, only available under NDA
or smth.

Nope it's documented on the web. The WDK contains example code for most
stuff as well.

- or parts would have to be included that had to be baught from
microsoft.

It's in the WDK which is a standard part of MSDN, and every company
working with windows programming has at least one copy of that somewhere.